Find the Confidence Interval Specified

Multiple Choice

Find the confidence interval specified. Assume that the population is normally distributed.
-A savings and loan association needs information concerning the checking account balances of its local customers. A random sample of 14 accounts was checked and yielded a mean balance of
$664.14 and a standard deviation of $297.29. Find a 90% confidence interval for the true mean Checking account balance for local customers.

A) $523.43 to $804.85
B) $455.65 to $872.63
C) $493.71 to $834.57
D) $492.52 to $835.76